MFSA2026-23: Security Vulnerabilities fixed in Thunderbird 149
Published Mar 24, 2026
·Updated
Security Vulnerabilities fixed in Thunderbird 149
Affected Software
1 affected componentFixes available
Mozilla Thunderbird<149
149
Event History
Mar 24, 2026
Advisory Published
via Mozilla·12:00 AM
Data Sourced
via Mozilla·12:00 AM
DescriptionSeverityAffected Software
Child vulnerabilities
Contains the following vulnerabilities.
- CVE-2026-3889
- CVE-2026-4371
- CVE-2026-4684
- CVE-2026-4685
- CVE-2026-4686
- CVE-2026-4687
- CVE-2026-4688
- CVE-2026-4689
- CVE-2026-4690
- CVE-2026-4691
- CVE-2026-4692
- CVE-2026-4693
- CVE-2026-4694
- CVE-2026-4695
- CVE-2026-4696
- CVE-2026-4697
- CVE-2026-4698
- CVE-2026-4699
- CVE-2026-4700
- CVE-2026-4701
- CVE-2026-4722
- CVE-2026-4702
- CVE-2026-4723
- CVE-2026-4724
- CVE-2026-4704
- CVE-2026-4705
- CVE-2026-4706
- CVE-2026-4707
- CVE-2026-4708
- CVE-2026-4709
- CVE-2026-4710
- CVE-2026-4711
- CVE-2026-4725
- CVE-2026-4712
- CVE-2026-4713
- CVE-2026-4714
- CVE-2026-4715
- CVE-2026-4716
- CVE-2026-4717
- CVE-2026-4726
- CVE-2025-59375
- CVE-2026-4727
- CVE-2026-4728
- CVE-2026-4718
- CVE-2026-4719
- CVE-2026-4720
- CVE-2026-4729
- CVE-2026-4721
Frequently Asked Questions
1
What is the severity of MFSA2026-23?
The severity of MFSA2026-23 is considered critical as it addresses multiple security vulnerabilities in Thunderbird.
2
How do I fix MFSA2026-23?
To fix MFSA2026-23, users should upgrade to Thunderbird version 149 or later.
3
What types of vulnerabilities are addressed in MFSA2026-23?
MFSA2026-23 addresses security vulnerabilities that could lead to remote code execution and data leaks.
4
Who is affected by MFSA2026-23?
Users of Mozilla Thunderbird versions prior to 149 are affected by MFSA2026-23.
5
When was MFSA2026-23 announced?
MFSA2026-23 was announced in conjunction with the release of Thunderbird 149.